$B C l_{3}$ does not exist as dimer but $B H_{3}$ exist as dimer $(B_{2} H_{6})$ because

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Large sized chlorine atom don't fit in between small boron atoms where as small sized hydrogen atom get fitted in between boron atoms.

Chlorine is more electronegative than Hydrogen

Chlorine has high electron affinity.

There is back bonding in $B C l_{3}$ but $B H_{3}$ does not contain such multiple bonds

answer is C.

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Detailed Solution

Chlorine is bigger than hydrogen,Large size chlorine atom don't fit in between small boron atoms where as small sized hydrogen atom get fitted in between boron atoms.

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